What are some potential drawbacks of using multiple date() functions within mktime() in PHP for rounding timestamps to days?

Using multiple date() functions within mktime() can lead to inaccuracies when rounding timestamps to days because each date() call may introduce a slight delay due to processing time. To solve this issue, it is recommended to use the strtotime() function to convert the timestamp to a date string, and then use mktime() to round the timestamp to days.

$timestamp = time();
$dateString = date("Y-m-d", $timestamp);
$roundedTimestamp = strtotime($dateString);
echo date("Y-m-d H:i:s", $roundedTimestamp);